The traditional thesaurus has over 2.5 million entries. The book icon to the right of the search field lights up whenever the search word offers synonyms in the thesaurus.
Tap/click on the book icon to jump between the rhyming dictionary and the dictionary & thesaurus.
Whenever you tap/click on the book icon the currently displayed rhyme mates are saved. If you look up additional words in the dictionary & thesaurus you can jump back to these saved rhymes by clicking on the section sign (§) inside the right corner of the dictionary’s search field.